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A thin gauge, steel strip technology, applied in the direction of metal rolling, profile control, etc., can solve the problems of large residual stress difference of steel strip, high heat transfer efficiency of steel strip, unfavorable plate shape, etc., and achieve the effect of simple operation and control
Active Publication Date: 2020-01-10
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD +1
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is that the heat transfer efficiency of the existing steel strip is high, and the temperature drop difference between...
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Embodiment 1
[0043] The 8.8mm thick X70 pipeline steel is obtained through molten iron pretreatment, converter smelting, LF heating furnace refining, RH vacuum refining, and continuous casting. Uniform weak cooling mode is adopted, and the billet casting speed is stable at 1.0-1.1m / min. The temperature rise rate of billet reheating is 6-8°C / min, and the furnace time is 241min. Adjust the roughing mill roll gap and vertical roll centering, optimize the roughing hydraulic system pressure, stabilize the roughing rolling load, adopt 5 rolling passes, and the reduction rate of each pass is 22%, 25%, 26%, and 27%. , 31%, the rolling loads of each pass are 27.3MN, 26.2MN, 30.3MN, 26.7MN, 34.1MN (Note: 1MN=10 6 N), use odd-numbered passes to remove phosphorus water, and roll the 230mm billet to 50mm. After flying shearing to remove the inconsistency between the head and the tail, the finish rolling is 7-stand hot continuous rolling, and the reduction rate of each pass is 33%, 30%, 24%, 21%, 16%,...
Embodiment 2
[0049] 11.1mm thick X70 pipeline steel, through molten iron pretreatment, converter smelting, LF heating furnace refining, RH vacuum refining, continuous casting to obtain steel slabs, the continuous casting crystallizer is put into operation with automatic liquid level control, 4mm light pressure, and secondary cooling water The uniform weak cooling mode is adopted, and the billet casting speed is 1.0m / min. The temperature rise rate of billet reheating is 5-6°C / min, and the furnace time is 317min. Adjust the roughing mill roll gap and centering of the vertical rolls, optimize the roughing hydraulic system pressure, stabilize the roughing rolling load, adopt 5 rolling passes, and the reduction rate of each pass is 21%, 22%, 25%, and 28%. , 28%, the rolling loads of each pass are 26.3MN, 27.0MN, 29.8MN, 27.2MN, 30.7MN (Note: 1MN=10 6 N), using odd-numbered passes of dephosphorization water to roll a 230mm billet to 56mm. After flying shearing to remove the position where the ...
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Abstract
The invention relates to a method for rolling a thin X70 pipeline steel strip, and belongs to the technical field of hot continuous rolling steel plate and steel strip rolling. The method comprises the following steps: a, manufacturing a steel billet; b, heating the steel billet, and sending the steel billet to a reheating process to be uniformly heated; c, performing dephosphorization treatment,specifically, high-pressure water is adopted to dephosphorize the steel billet; d, performing rough rolling, namely rolling the steel billet into a steel strip through a rough rolling mill; e, performing finish rolling; and f, carrying out laminar flow cooling to prepare a steel strip, cooling the steel strip by adopting water cooling, wherein the proportions of boiling water of an upper header pipe to boiling water of a lower header pipe of laminar flow cooling is 70% and 100%, starting side water spraying or side air spraying to purge accumulated water on the surface of a steel plate, and controlling the temperature of laminar flow cooling water within the range of 29+/-1 DEG C. According to the method, the wave shape of the steel strip is improved by optimizing the laminar cooling process, and the problems that due to the fact that the heat transfer efficiency of the steel strip is high in the cooling process of existing thin X70 pipeline steel, the temperature drop difference between the edge part and the middle part of the steel strip is larger, and thus the residual stress difference in the steel strip is larger, and a good plate shape is not well maintained are solved.
Description
technical field [0001] The invention relates to a thin-gauge X70 pipeline steel strip rolling method, which belongs to the technical field of hot continuous rolling steel plate and steel strip rolling. Background technique [0002] X70 and above grade pipeline steel generally adopts acicular ferrite structure type, controlled rolling and controlled cooling process adopts low temperature coiling route, laminar cooling water volume is large, cooling speed is fast, coiling temperature is low, coupled with thin gauge steel plate heat transfer The efficiency is high, and it is easy to produce waves, which seriously affects the tube forming and welding. As the cooling progresses, along the width direction, the temperature distribution of the steel strip is uneven. The middle part of the steel strip is one-dimensional heat transfer, and the edge of the steel strip is two-dimensional heat transfer. During the cooling process, the cooling water is continuously flowing on the surface ...
Claims
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